Power supply heat sink



FIG. 1 is a right side elevational view of a power supply heat sink showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof; and

FIG. 5 is a rear, left side perspective view thereof, on an enlarged scale. 

The ornamental design for a power supply heat sink, as shown and described. 